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The first phase of the Marmaray project opened with an undersea rail tunnel (train pictured) across the Bosphorus strait.
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Marmaray
Suburban rail line in Istanbul
Marmaray is a 76.6-kilometre-long (47.6 mi) commuter rail line located in Istanbul, Turkey. The line runs from Halkalı, on the European side, to Gebze, on the Asian side, along the north shore of the Sea of Marmara. Mostly using the right-of-way of two existing commuter rail…Source: Wikipedia (CC BY-SA)
Marmaray Tunnel
Rail passage under the Bosporus
The Marmaray Tunnel is a 13.5 km (8.4 mi) long undersea railway tunnel in Istanbul, Turkey, beneath the Bosporus strait, linking Kazlıçeşme, Zeytinburnu in Europe with Ayrılıkçeşmesi in Asia. The tunnel consists of two single track tunnels with three underground railway…Source: Wikipedia (CC BY-SA)
Bosporus
Narrow strait in northwestern Turkey
The Bosporus or Bosphorus Strait is a natural strait and an internationally significant waterway located in Turkey which is straddled by the city of Istanbul. The Bosporus connects the Black Sea to the Sea of Marmara and forms one of the continental boundaries between Asia and…Source: Wikipedia (CC BY-SA)